Modular Battery Pack with Current Detection for Cordless Tools
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Solution Overview
Problem
Cordless electric tools using stackable cell assembly technology face challenges with overcurrent protection, selecting appropriate cell assemblies for varying load fluctuations, and elongated charging times due to the inability to charge an arbitrary number of cell assemblies simultaneously.
Innovation Solution
Incorporating current and voltage detecting means with switching elements to control current flow through cell groups, protecting against overcurrent and allowing for flexible cell assembly configuration, and enabling simultaneous charging of cell assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If multiple cell assemblies are connected in parallel to increase current capacity, then the battery can satisfy various user needs and extend operation time, but the charging time is elongated because the charger cannot charge an arbitrary number of cell assemblies simultaneously
Solution Approach 1:
The battery device is divided into multiple independent cell assemblies (first cell assembly, second cell assembly, etc.), each with its own charging terminals. This segmentation allows the charger to charge multiple cell assemblies simultaneously by connecting to each assembly's terminals independently, thus reducing total charging time while maintaining the ability to provide high current capacity through parallel connection.
2Adaptability or versatility
If cell assemblies are connected in parallel to provide higher current capacity, then the battery can support various operational needs, but overcurrent may occur due to unbalanced charges between cell assemblies
Solution Approach 1:
The patent incorporates current detecting means in each cell assembly that continuously monitors the current flow. When overcurrent is detected (due to unbalanced charges or excessive load), the detecting means sends a signal to the control means, which then activates the switching element to interrupt the current flow, preventing damage to the battery cells.
Solution Approach 2:
The control means acts as an intermediary between the current detecting means and the switching element. It receives detection signals, processes the overcurrent condition, and controls the switching element accordingly, providing intelligent protection while allowing normal operation.
3Ease of operation
If conventional battery devices with fixed current capacity are used, then the structure is simple, but the user cannot adapt the battery to different operational requirements
Solution Approach 1:
The battery device allows dynamic configuration by enabling users to connect cell assemblies in series or parallel based on operational needs. The control means dynamically adjusts the connection configuration and current distribution, transforming a static battery structure into a dynamic system that adapts to different voltage and current requirements.
Data Source
AI summary
A battery device is constituted by connecting such cell assemblies in parallel as each includes: a first cell group having a plurality of cells connected in series; a housing container for housing the first cell group; current detector housed in the container for detecting a current to flow through the first cell group; a switching element connected with the first cell group for turning ON/OFF the current to flow through the first cell group; and a controller for controlling the ON/OFF of the switching element in response to the output signal of the current detector.